Fixes compiler warnings about shadowing global declaration
of screen.
Merge pull request #320 from hean01/bugfixes

Fixes compiler warnings about shadowing global declaration of screen.
Allow the keyword "currency" in enemy loot entries
Merge branch 'master' of https://github.com/clintbellanger/flare-engine
Merge branch 'master' of https://github.com/clintbellanger/flare-engine
Default gold drops for enemies